A purpose, an intention, a design, strikes everywhere even the careless, the most stupid thinker.

The line expresses a classic “design” intuition: when we look at nature (or complex systems), we spontaneously perceive purposiveness—an appearance of intention or plan—so strongly that even an inattentive observer feels it. In Hume’s hands, however, such remarks typically function within a critical examination of arguments from design (teleological arguments) rather than as an endorsement of them. The significance is that Hume acknowledges the psychological force of the inference to purpose while probing whether that impression warrants a sound conclusion about a designing mind. The quote thus highlights the tension between intuitive pattern-seeking and rigorous philosophical justification.